Basic

Support

Required licenses

Any

Recommended images

Any

Location

[…]C:\Users\Public\Documents\Euresys\Open eVision 24.02\Sample Programs
\[LANGUAGE] samples\Image Processing\Basic

C++:

C:\Users\Public\Documents\Euresys\Open eVision 24.02\Sample Programs\MsVc samples\Image Processing\Basic
C#:

C:\Users\Public\Documents\Euresys\Open eVision 24.02\Sample Programs\MsVcs samples\Image Processing\Basic
Qt:

C:\Users\Public\Documents\Euresys\Open eVision 24.02\Sample Programs\Qt samples\Image Processing\Basic
VB.NET:

C:\Users\Public\Documents\Euresys\Open eVision 24.02\Sample Programs\MsVbNET samples\Image Processing\Basic

Purpose

This sample program demonstrates how to:

□ Display an image.
□ Display and graphically interact with an ROI.

Code highlights

1. Load an image file from the disk into an EImage object. 
image.Load(…);
2. Attach (associate) an ROI to the image.
► The ROI gives access to the selected part of the image content. 
roi.Attach(image);
3. Position and size the attached ROI on the image. 
roi.SetPlacement(orgX, orgY, width, height);
4. Draw the image in a graphical device context. 
image.Draw(context);
5. Draw the frame (the external rectangle) of the ROI in a graphical device context.
□ The second parameter enables the handles to manually manipulate the ROI position and size. 
roi.DrawFrame(context, true);
6. Retrieve the cursor coordinates after clicking. 
handle = roi.HitTest(x, y);
7. Move the handle to its new retrieved position and modify the ROI accordingly. 
roi.Drag(handle, x, y);